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The timeseries is calculated from the HadISST and the NCEP OI Datasets. It is the standardized Nina 12 minus the Nina 4 with a 5 month running mean applied which is then standardized using the 1950-1979 period.
Time Interval: Monthly
Time Coverage: 1871 to present
Update Status: updated monthly
TNI: Standard PSD Format (What is standard format?)
Data is from NOAA PSD using the HadISST dataset. Index was originally developed by Kevin Trenberth of NCAR/CGD. PSD is updating the index each month. This version is based on the latest HADISST and NCEP OI datasets.
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NOAA ESRL Physical Sciences Division
Document maintained by Cathy Smith (email@example.com)
Updated: Oct 15, 2009 15:06:01 MDT